Epidemiology and Infection

Original Papers

Streptococcus suis infection in Hong Kong: an emerging infectious disease?

E. MAa1 c1, P. H. CHUNGa1, T. SOa2, L. WONGa2, K. M. CHOIa3, D. T. CHEUNGa4, K. M. KAMa4, S. K. CHUANGa1, T. TSANGa1 and on behalf of the Collaborative Study Group on Streptococcus suis infection in Hong Kong

a1 Surveillance and Epidemiology Branch, Centre for Health Protection, Department of Health, Hong Kong Special Administrative Region

a2 Infection Control Branch, Centre for Health Protection, Department of Health, Hong Kong Special Administrative Region

a3 Hospital Authority, Hong Kong Special Administrative Region

a4 Public Health Laboratory Services Branch, Centre for Health Protection, Department of Health, Hong Kong Special Administrative Region

SUMMARY

We conducted a 31-month retrospective review of all laboratory-confirmed Streptococcus suis infections admitted to public hospitals in Hong Kong. Strain identification, serotyping and antibiotic susceptibility tests were conducted on S. suis isolates. Twenty-one sporadic cases were identified, comprising 18 (86%) males and 3 (14%) females. About half were patients aged xs2A7E65 years. More cases occurred during summer. Occupational exposure was documented in five (24%) cases. The estimated annual incidence was 0·09/100 000 in the general population and 32/100 000 in people with occupational exposure to pigs and raw pork. The primary clinical manifestations were meningitis (48%), septicaemia (38%) and endocarditis (14%). The case-fatality rate was 5%. All available isolates from 15 patients were serotype 2, sensitive to penicillin, ampicillin, ceftriaxone, but resistant to tetracycline. Injury prevention and proper handling of pigs or raw pork should be advocated to both at-risk occupational groups and the general population.

(Accepted December 19 2007)

(Online publication February 06 2008)

Correspondence:

c1 Author for correspondence: Dr E. Ma, M.B.ChB., Pdip Community Geriatric (Hong Kong), PDip Epidemiology and Biostatistics (CUHK), Senior Medical and Health Officer, Surveillance and Epidemiology Branch, Centre for Health Protection, Department of Health, Hong Kong Special Administrative Region.(Email: smo_ss4@dh.gov.hk)

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